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1 of 4 zones working

I just insatlled a 4 zone rainbird controller. After install I manually turned on each zone and all is well. I programmed it and it worked fine. I noticed today (a few weeks after install) that only zone 1 works. The controller shows it is changing zones but when zones 2-4 are on the zone does not work. No water at all. I think I have multiple valves I see 2 boxes (1 on each side of the house). Anyone help me get started on troubleshooting this?
Thanks
Frank

When mutiple valves don't work all of a sudden the first thing I look for is a disconnected ground wire. You say there's two boxes. Is there 1 valve in 1 box and 3 valves in the other? Check at the controller. Is there two ground wires? One may have come loose. On occasion someone's shut the water off to the valves. Good luck!